Affair rumours: KIIS FM caller claims 'someone' hooked up with one of The Chainsmokers despite both the boys being in relationships

They're the American music duo who have enjoyed worldwide success with hits like Closer and Don't Let Me Down.

And according to one fan, The Chainsmokers' Alex Pall, 32, and Andrew 'Drew' Taggart, 27, may have gotten up to mischief during their time away from home - specifically while visiting Sydney last year.

Speaking to KIIS FM's The Thinkergirls last month, caller 'Carly' alleged one of the men cheated on their girlfriend during a raunchy night Down Under.

What happens on tour, stays on tour? The Chainsmokers Andrew Taggart (left) and Alex Pall (right) are both reportedly in relationships but one caller told KIIS FM's Thinkgirls that 'someone' hooked up one of them when they were in Sydney last year

Chatting to radio hosts Stacey June and Kristie Mercer, Carly claimed she and her sister sent an Instagram DM to the musicians, which later led to a 'hook up'.

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'Me and my sister thought it would be so funny to just DM them and say 'hey babes' - like acting so cool and they messaged us back and invited us to their show,' she spilled.

The caller said the women ended up hanging out backstage with the New York DJ duo all night, and claimed: 'Someone hooked up with someone'.

Flabbergasted! Radio hosts Stacey June (left) and Kristie Mercer (right) were left shocked by the caller's claims, explaining Alex Pall previously told them both her and Drew aren't single

Radio hosts Stacey and Kristie were left shocked by the information, explaining that at the time The Chainsmokers were in Australia, Alex Pall confirmed in an interview he and Drew 'both had girlfriends'.

Responding to the reveal of the boys' relationship statuses, Carly confirmed everyone was aware of the situation.

'They were talking about it to us actually, so they both have girlfriends but it's apparently cool,' she said.

'It's apparently cool': Caller 'Carly' claimed The Chainsmokers told the girls they were both in relationships

Performance pros: The Chainsmokers regularly tour the world and performed a surprise gig in Sydney in April last year

The Chainsmokers were last in Australia in April 2016, when they performed a surprise free gig at Sydney’s Jam Gallery in Bondi Junction.

After fans flooded the stage, the gig was later relocated to World Bar in Kings Cross.

Matching the timelime, the interview in which Alex revealed that neither of the men are single allegedly took place during the same time period.

However, there is no evidence aside from Carly's verbal claims that the incident took place.

Daily Mail Australia has reached out to The Chainsmokers for comment.

'Someone hooked up with someone': Carly claimed the raunchy night with one of The Chainsmokers began after she and her sister sent an Instagram DM to the duo